Dan Siegel, an Oakland civil rights attorney and activist with a long history of working with radical leftist political movements, joined a group of more than 150 supporters in front of Oakland City Hall on Jan. 9 to announce his candidacy for mayor.

With this development, the mayor's race in Oakland is sure to be closely watched by Bay Area progressives. Siegel's bid represents a fresh challenge from the left against Mayor Jean Quan at a time when concerns about policing, intensifying gentrification, and economic inequality are on the rise.

Siegel is the latest in a growing list of challengers that includes Joe Tuman, a political science professor who finished fourth in the 2010 mayor's race; Oakland City Councilmember Libby Schaaf; and Port Commissioner Bryan Parker.

In a campaign kickoff speech emphasizing the ideals of social and economic justice, Siegel laid out a platform designed "to make Oakland a safe city." But he brought an unusual spin to this oft-touted goal, saying, "We need people to be safe from the despair and hopelessness that comes from poverty and long-term unemployment. We need safety for our tenants from unjust evictions and ... gentrification."

Siegel voiced support for raising the city's minimum wage to $15 an hour. He also called for shuttering Oakland's recently approved Domain Awareness Center, a controversial surveillance hub that integrates closed circuit cameras, license plate recognition software, and other technological law enforcement tools funded by a $10.9 million grant from the federal Department of Homeland Security.

He spoke about pushing for improvements in public education "to level the playing field between children from affluent backgrounds and children from poor backgrounds," and described his vision for reorganizing the Oakland Police Department to foster deeper community engagement.

Among Siegel's supporters are East Bay organizers with a deep history of involvement in social justice campaigns. His campaign co-chair is Walter Reilly, a prominent Oakland National Lawyers Guild attorney who said he's been involved with civil rights movements for years. "This is a continuation of that struggle," Reilly told the Bay Guardian, adding that leadership affiliated with "a progressive and class-conscious movement" is sorely needed in Oakland.

Left Coast Communications was tapped as Siegel's campaign consultant. Siegel's communications director is Cat Brooks, an instrumental figure in Occupy Oakland and the grassroots movement that arose in response to the fatal BART police shooting of Oscar Grant, whose Onyx Organizing Committee is focused on racial justice issues.

Olga Miranda, an organizer with San Francisco janitors union, SEIU Local 87, also spoke on Siegel's behalf during the kickoff event. "San Francisco has become for the rich, and we understand that," she said. "But at the same time, Oakland isn't even taking care of its own."

Referencing a recent surge in Oakland housing prices due in part to an influx of renters priced out of San Francisco, she added, "Dan understands that if you live in Oakland, you should be able to stay in Oakland."

Siegel's decision to challenge Quan for the Mayor's Office has attracted particular interest since he previously served as her legal advisor, but their relationship soured after a public disagreement.

In the fall of 2011, when the Occupy Oakland encampment materialized overnight in front of Oakland City Hall, Siegel resigned from his post as Quan's adviser over a difference in opinion about her handling of the protest movement. Police crackdowns on Occupy, which resulted in violence and the serious injury of veteran Scott Olsen and others, made national headlines that year.